Monitor black screen fault repair

First, the computer host failure caused by black screen failure of the monitor we can from the following ideas to solve--

1. Check the installation quality of fittings

When you are assembling a computer or replacing accessories, a black screen failure occurs, you should first check the installation quality of your accessories. For example, if the memory bar is properly installed and is in good contact with the motherboard slot, display cards, such as card is installed in place, the relevant settings in the BIOS and the motherboard on the correct selection of jumpers, you can carefully refer to the relevant Board card instructions to set up, another key to check the quality of the board itself and the motherboard on the relevant slots and cards on the It is also necessary to have a foreign body in the gold finger and be polluted by grime.

In addition to whether the CPU is overclocking or is "mistakenly" used for overclocking (especially for some soft jumper motherboards, the system's "Automatic" error setting is more likely to cause this type of failure), the hard disk or optical drive data cable is connected to the counter and so on you need to consider. And for such problems, it is best to use the "minimum system method" and "replacement method" for the diagnosis, the host will only leave the motherboard, graphics, memory, CPU to try, especially the quality of the memory bar caused by such a relatively high rate of failure, if no problem, you can focus on the quality of other accessories, such as still black screen, Can focus on these parts and then carefully installed after the connection restart to try, such as can not solve the problem, the relevant parts can be replaced by the good or bad test parts.



In addition, it is important that you also understand whether the host power and power switches are good or bad, and whether they are connected properly or not, all of which may result in a complete black screen, which you need to focus on to understand. If there is a problem with the power supply, then you open the computer after the visible host chassis panel LED is not lit, and can not hear the host power supply fan rotation and hard drive self-test, etc., it shows that your host system does not have a normal power supply. This type of problem you should first check whether there is an external AC power, use pencil to see if there is power on the outlet. The next step is to determine if the power cord is connected to the power supply on the side of the host if necessary, use a multimeter to test whether the voltage is sufficient, the voltage is too high or too low can cause the host power supply overvoltage or undervoltage circuit of the automatic stop protection, if the above is no problem, then you should focus on the maintenance of the main internal and power switch and reset key, Also adopt the minimum system method and the replacement method, each unplug the main engine card and other equipment power cord, signal line, and then power test machine, such as the removal of a device when the host power to restore work, it is just pulled out of the equipment damaged or improperly installed lead to short circuit, so that the power supply short-circuit protection circuit to start, stop on the machine power supply, Then you can focus on its contact, if necessary, replace and try again, and also focus on the power switch and reset key quality and their connection with the motherboard is correct or not is important, Because many inferior chassis power switch and the reset key often occurs several times after its internal metal contact piece breaks and has the power short circuit situation, causing the whole machine black screen without any display. If the above check does not solve the problem, then please replace the power supply to try.

2. Listen to the problem of color discrimination

The computer appears black screen fault more time performance in the boot after the host panel indicator light, fan normal rotation, but the PC horn alarm sound; or internal chassis such as hard disk and other related equipment normal self-test, but the monitor does not show. At this time in addition to the above methods of maintenance, more important is to learn to debate the error of PC speakers to identify the fault, in addition to observe the failure of the host or monitor the various indicators of the flash situation to judge The fault is also very good.

For example, host normal self-test, but the monitor appears "black screen" failure, for this failure we can focus on the motherboard-display card-monitor cable-monitor this idea to consider. First check the monitor power LED is lit, such as normal, you can focus on adjusting the brightness, contrast button, excluding the "common" such false black screen failure. If there is no problem, then you can focus on checking the host display card to the monitor connection cable whether there is a problem and cable on the plug in the needle is a skew fracture and whether it is connected with the display card tightly, in addition, the cable connector can be removed to see if the monitor can be properly lit or connect the monitor to other hosts to try, In order to determine whether the fault is from the host or the monitor itself caused.

Again, the monitor is black and the speaker in the host emits a long sound, two or three short beeps or continuous beeps, indicating that there is a problem with the connection between the display card and the motherboard, or the connection between the display card and the monitor is problematic, you can focus on checking its slot contact whether there is a good slot for foreign objects and can be replaced by the screen to try, If no improvement, can initially indicate the problem on the motherboard, you can take the graphics card to other motherboards to try. Another example, the emergence of continuous long sound, most of which indicates that there is a problem with memory, can focus on the memory and memory slot installation contact. If the machine emits a tick-tock continuous short sound, it indicates that there is a slight short-circuit in the machine, the minimum system method and the elimination method to solve the problem, until the location of the short circuit found. In addition, if you hear the two short beeps, it indicates that the motherboard or display card or monitor may be a problem, do not connect the monitor if it is still so chirping, the display card site problems, such as a short sound, it indicates that there is a problem with the display.